MechanicDB
Home / Diagnostic Decoder / Powertrain System / Code P1345
System: Powertrain (P-Code) Coverage: OEM Specific (Chevrolet) Fault Family: crank_cam_correlation

Code P1345: CKP/CMP Correlation

Diagnostic & Technical Explanation
Code P1345 (CKP/CMP Correlation) sets when the ECM compares crankshaft and camshaft position signals and finds their relative timing outside the expected window, or cannot establish a stable engine position sync. This is most often caused by timing chain/belt stretch or a jumped tooth, a failing crankshaft or camshaft position sensor, worn tensioner/guides, or reluctor-wheel damage.

Probability-Ranked Repair Procedures (3 Ranked Fixes)

Rank #1

Inspect and replace crankshaft/camshaft position sensor

Moderate DIY
Parts Estimate: $25.0–$90.0 USD Labor Estimate: 0.8 Shop Hours
  1. 1. Identify which sensor the correlation fault points to on the scan tool freeze frame
  2. 2. Unplug and remove the affected position sensor
  3. 3. Inspect the reluctor wheel/tone ring for chips or debris
  4. 4. Install the new sensor with correct air-gap shim and clear codes
Required Replacement Parts: 🔧 Crankshaft position sensor · 🔧 Camshaft position sensor
Rank #2

Inspect timing chain/belt for stretch or jumped timing

Professional Required
Parts Estimate: $150.0–$900.0 USD Labor Estimate: 3.5 Shop Hours
  1. 1. Remove the timing cover and verify cam-to-crank alignment against factory timing marks
  2. 2. Measure chain stretch or check belt tooth wear
  3. 3. Replace the timing chain/belt, tensioner, and guides as a set
  4. 4. Reset timing to factory marks and verify correlation with a scan tool
Required Replacement Parts: 🔧 Timing chain/belt kit (chain or belt, tensioner, guides)
Rank #3

Repair crank/cam sensor wiring and connectors

Professional Required
Parts Estimate: $10.0–$60.0 USD Labor Estimate: 1.2 Shop Hours
  1. 1. Back-probe the sensor signal and ground at each connector while cranking
  2. 2. Voltage-drop test the harness runs back to the ECM
  3. 3. Repair chafed conductors near the timing cover with heat-shrink splices
  4. 4. Confirm clean square-wave signals on a scope
Required Replacement Parts: 🔧 Automotive wiring repair kit (solder + heat-shrink)

Need All 15,886 OBD-II Codes & 56,561 Fixes?

Download the complete commercial MechanicDB dataset instantly. Includes CSV, Apache Parquet tables, and a relational SQLite database with commercial application rights.

License Full Dataset · Instant Download ($49)